libvpx: Pull from upstream

source/libvpx/vpxdec.c

 /*
  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 483 matching lines @@
 }
 
 
 static int
 webm_guess_framerate(struct input_ctx *input,
                      unsigned int     *fps_den,
                      unsigned int     *fps_num) {
   unsigned int i;
   uint64_t     tstamp = 0;
 
+  /* Check to see if we can seek before we parse any data. */
+  if (nestegg_track_seek(input->nestegg_ctx, input->video_track, 0)) {
+    fprintf(stderr,
+            "WARNING: Failed to guess framerate (no Cues), set to 30fps.\n");
+    *fps_num = 30;
+    *fps_den = 1;
+    return 0;
+  }
+
   /* Guess the framerate. Read up to 1 second, or 50 video packets,
    * whichever comes first.
    */
   for (i = 0; tstamp < 1000000000 && i < 50;) {
     nestegg_packet *pkt;
     unsigned int track;
 
     if (nestegg_read_packet(input->nestegg_ctx, &pkt) <= 0)
       break;
 
@@ skipping 657 matching lines @@
     if (arg_match(&arg, &looparg, argi)) {
       loops = arg_parse_uint(&arg);
       break;
     }
   }
   free(argv);
   for (i = 0; !error && i < loops; i++)
     error = main_loop(argc, argv_);
   return error;
 }